CN105149727B - A kind of medium carbon steel casting defect minimizing technology - Google Patents
A kind of medium carbon steel casting defect minimizing technology Download PDFInfo
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- CN105149727B CN105149727B CN201510614652.9A CN201510614652A CN105149727B CN 105149727 B CN105149727 B CN 105149727B CN 201510614652 A CN201510614652 A CN 201510614652A CN 105149727 B CN105149727 B CN 105149727B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/013—Arc cutting, gouging, scarfing or desurfacing
Abstract
The present invention relates to casting defect recovery technique field, more particularly to a kind of medium carbon steel casting defect minimizing technology.The method of the present invention includes cast(ing) surface and preheats and carry out carbon arc air gouging, Magnetic testing at high operating temperatures, and high temperature casting is directly then carried out into Welding Repair.The method of the present invention, according to the CCT curve of mild steel material, suitable preheating temperature is selected with reference to Ms point temperature and Mf point temperature and the operability of gouge, carry out high temperature carbon arc air gouging, the probability to be ftractureed after carbon arc air gouging can be effectively reduced, and high temperature polishing, detection and Welding Repair are directly carried out after high temperature gouge, further can prevent casting from ftractureing, and the preheating cost of repair welding process is reduced, shorten the production cycle.
Description
Technical field
The present invention relates to casting defect recovery technique field, more particularly to a kind of medium carbon steel casting defect minimizing technology.
Background technology
In carbon steel material, with the increase of phosphorus content, the hardness and intensity of steel are improved, but its plasticity and toughness drop
Low, steel comprehensive mechanical performance shows as hard and crisp.Medium carbon steel main alloy element is C, Si, Mn, and carbon content is 0.3% ~ 0.6%
Between, a certain amount of Cr, Mo alloying element is also contained in casting composition, therefore, the carbon equivalent of material is close to 1.0%.And work as steel
Carbon equivalent when reaching more than 0.6%, just belong to and easily split material, its plasticity is low, tendency of hardenability is big.For such steel, carrying out
When carbon arc air gouging and electric arc weld, heat affected area easily produces hard and crisp martensitic structure, so as to cause heat affected area hard
Degree is high, plasticity is poor, is easy to crack.In addition carbon arc air gouging again leads to steel surface carburizing, considerably increases such steel
The probability of material carbon arc air gouging cracking.But due to carbon arc air gouging have excavate efficiency high, flexibility, it is workable the advantages of, it is existing
Stage, overwhelming majority enterprise still removed the defects of steel-casting using the method for carbon arc air gouging.
Generally, defect forms pit after carbon arc air gouging, when hole bottom is in silver gray and smooth, without macroscopic defect
When for processing complete.For ordinary carbon steel, low-alloy steel and stainless steel, under normal temperature state, defect is dug through carbon arc air gouging
After removing, hole bottom will not crack defect, and carbon arc air gouging belongs to transient heating, and the position after its gouge remains close to room
Temperature, normal temperature magnetic powder detection is carried out after the light that can directly polish.But for medium carbon steel, when carrying out normal temperature gouge, gouge
During and gouge terminate after some period in, gouge position can ftracture again.The variation of its crack form, predominantly
Single linear is distributed or net distribution, and continuing carbon arc air gouging also can not thoroughly excavate crackle totally, finally also result in very big
Soldering amount, increase the soldering difficulty and wlding use cost reprocessed, increase the castings production cycle, even result in casting report
It is useless.
The content of the invention
The problem of present invention exists for prior art, there is provided a kind of medium carbon steel casting defect minimizing technology, to reduce casting
The probability that part ftractures again, repair welding of casting amount is reduced, reduce casting defect rehabilitation cost.
The object of the present invention is achieved like this, a kind of medium carbon steel casting defect minimizing technology, comprises the following steps:
A) casting is placed on horizontal workbench, adjusts the placing direction of casting, make the position that casting defect is intensive
In level, overall uniformly preheating is carried out using natural gas economizer bank to cast(ing) surface, the bulk temperature for making cast(ing) surface is 202
℃—218℃；
B) step A is being kept) under conditions of preheating temperature, type, the depth according to the defects of casting, defect is divided into linearly
Defect and NONLINEAR DEFECT, for NONLINEAR DEFECT use a diameter of Φ 19mm carbon-point, current control 1400A ~ 1600A it
Between carry out carbon arc air gouging, the defects of being detected according to NDT size and depth, defect is excavated；For linear discontinuities, first in defect
Both ends gouge stop hole, then along the track of linear discontinuities some ceasmas of uniform gouge again, the adjacent crack arrest pitch of holes is 40 ~
50mm, the depth of the stop hole is detection+5 ~ 10mm of depth of defect, finally since the stop hole of one end, along defect
Linear track penetrates each stop hole gouge；
C after) carbon arc air gouging terminates, continue to keep cast(ing) surface gouge spot temperature at 202 DEG C -218 DEG C, using resistance to height
Warm emery wheel grinding-head is polished the hardened layer at carbon arc air gouging position, to spill metallic luster, directly to casting defect after polishing
Remove position and carry out dry powder detection, after detection is qualified, directly carry out Welding Repair.
The method of the present invention, according to the CCT curve of mild steel material, with reference to Ms point temperature and Mf point temperature and gouge can
The suitable preheating temperature of Sexual behavior mode is operated, high temperature carbon arc air gouging is carried out, can effectively reduce the probability to be ftractureed after carbon arc air gouging, and
And high temperature detection and Welding Repair are directly carried out after high temperature gouge, further it can prevent casting from ftractureing, and reduce repair welding work
The preheating cost of sequence, shorten the production cycle.In addition, the present invention is only preheated using natural gas economizer bank to the surface of casting,
Quick heating, preheating cost is low, is easy to side to keep preheating temperature, and side carries out carbon arc air gouging operation, so as to further prevent casting from opening
Split.
For ease of realizing that cast(ing) surface uniformly preheats, the step A）In natural gas economizer bank be uniformly distributed in casting table
Face, the surface of the natural gas economizer bank are uniformly provided with some ventholes, during installation, venthole and the casting table of the economizer bank
The holding 100-110mm in face distance, during preheating, temperature monitoring is carried out to cast(ing) surface by infrared measurement of temperature equipment, and pass through
Adjust the preheating temperature of the gas quantity control cast(ing) surface of natural gas economizer bank.
For ease of optimizing the parameter of carbon arc air gouging, the step B) in, when carrying out carbon arc air gouging to linear discontinuities position, when
When the depth of linear discontinuities is less than 30mm, a diameter of Φ 13mm of carbon-point, electric current is 1000A ~ 1200A, when the depth of linear discontinuities
During more than 30mm, a diameter of 16 ~ 19mm of Φ of carbon-point, electric current is 1200A ~ 1600A.
Embodiment
The medium carbon steel casting defect minimizing technology of the present invention, comprises the following steps:
A) casting is placed on horizontal workbench, adjusts the placing direction of casting, make the position that casting defect is intensive
In level, overall uniformly preheating is carried out using natural gas economizer bank to cast(ing) surface, the bulk temperature for making cast(ing) surface is 202
℃—218℃；For ease of making cast(ing) surface uniformly preheat, when arranging natural gas economizer bank, gas economizer bank is uniformly distributed in casting
Part surface, for ease of being heated to the uniform flame of cast(ing) surface, the surface of natural gas economizer bank is uniformly provided with some ventholes, installs
When, the venthole of economizer bank is kept 100-110mm distance with cast(ing) surface, make preheating flare length consistent, during preheating, lead to
Cross infrared measurement of temperature equipment and temperature monitoring is carried out to cast(ing) surface, and the combustion gas input by adjusting natural gas economizer bank controls flare
Size is to adjust the preheating temperature of cast(ing) surface in above-mentioned heat range；B under conditions of) walking preheating temperature in holding, root
According to type, the depth the defects of casting, defect is divided into linear discontinuities and NONLINEAR DEFECT, general linear defect, which refers to, to be put forward crackle class and lack
Fall into, NONLINEAR DEFECT refers to sand holes, loose etc., and a diameter of Φ 19mm carbon-point is used for NONLINEAR DEFECT, and current control exists
Carbon arc air gouging is carried out between 1400A ~ 1600A, position the defects of casting is removed smooth without obvious convex-concave to surface；For linear
Defect, first in the both ends gouge stop hole of defect, then along the track of linear discontinuities some ceasmas of uniform gouge again, adjacent crack arrest
Pitch of holes is 40 ~ 50mm, and the depth of stop hole is detection+5 ~ 10mm of depth of defect, finally since the stop hole of one end, edge
The linear track of defect penetrates each stop hole gouge, make linear discontinuities position formed spill together metal this material gouge it is recessed
Groove, the crack defect that groove surfaces are visible by naked eyes；When carrying out carbon arc air gouging to linear discontinuities position, when the depth of linear discontinuities
During less than 30mm, a diameter of Φ 13mm of carbon-point, electric current is 1000A ~ 1200A, when the depth of linear discontinuities is more than 30mm, carbon-point
A diameter of 16 ~ 19mm of Φ, electric current are 1200A ~ 1600A.C after) carbon arc air gouging terminates, economizer bank continues to heat, and keeps casting table
Face gouge spot temperature is beaten the hardened layer at carbon arc air gouging position at 202 DEG C -218 DEG C, using high temperature resistant emery wheel grinding-head
Mill, position directly is removed to casting defect to spill metallic luster, after polishing and carries out dry powder detection, certified products directly carry out repair welding
Repair.
The present invention changes the method that normal temperature carbon arc air gouging of the prior art removes casting defect, passes through high temperature carbon arc gas
Plane, detection, polishing, remove carbon arc air gouging case-carbonizing layer, ensure that medium carbon steel of the carbon content between 0.3% ~ 0.6% exists in time
Defect removal process does not ftracture, and shortens casting defect repairing efficiency, reduces rehabilitation cost.
Claims (3)
1. a kind of medium carbon steel casting defect minimizing technology, its feature comprise the following steps:
A) casting is placed on horizontal workbench, adjusts the placing direction of casting, the intensive position of casting defect is in water
It is flat, overall uniformly preheating is carried out using natural gas economizer bank to cast(ing) surface, the bulk temperature for making cast(ing) surface is 202 DEG C ~ 218
℃；
B) step A is being kept) under conditions of preheating temperature, type, the depth according to the defects of casting, defect is divided into linear discontinuities
And NONLINEAR DEFECT, the carbon-point for NONLINEAR DEFECT using a diameter of Φ 19mm, current control are entered between 1400A ~ 1600A
Row carbon arc air gouging, the defects of being detected according to NDT size and depth, defect is excavated；For linear discontinuities, first at the both ends of defect
Gouge stop hole, then along the track of linear discontinuities, some stop holes of uniform gouge, adjacent crack arrest pitch of holes are 40 ~ 50mm again,
The depth of the stop hole is detection+5 ~ 10mm of depth of defect, finally since the stop hole of one end, along the linear rails of defect
Mark penetrates each stop hole gouge；
C after) carbon arc air gouging terminates, continue to keep cast(ing) surface gouge spot temperature to grind using high temperature resistant emery wheel at 202 ~ 218 DEG C
Head is polished the hardened layer at carbon arc air gouging position, and to spill metallic luster, directly position is removed to casting defect after polishing
Dry powder detection is carried out, after detection is qualified, directly carries out Welding Repair.
2. medium carbon steel casting defect minimizing technology according to claim 1, it is characterised in that the step A）In day combustion
Gas economizer bank is uniformly distributed in cast(ing) surface, and the surface of the natural gas economizer bank is uniformly provided with some ventholes, during installation, institute
State the venthole of economizer bank and cast(ing) surface and keep 100 ~ 110mm distances, during preheating, by infrared measurement of temperature equipment to cast(ing) surface
Temperature monitoring is carried out, and the preheating temperature of cast(ing) surface is controlled by adjusting the gas quantity of natural gas economizer bank.
3. medium carbon steel casting defect minimizing technology according to claim 1, it is characterised in that the step B) in, to line
Property rejected region when carrying out carbon arc air gouging, when the depth of linear discontinuities is less than 30mm, a diameter of Φ 13mm of carbon-point, electric current is
1000A ~ 1200A, when the depth of linear discontinuities is more than 30mm, a diameter of 16 ~ 19mm of Φ of carbon-point, electric current is 1200A ~ 1600A.
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| CN201510614652.9A CN105149727B (en) | 2015-09-24 | 2015-09-24 | A kind of medium carbon steel casting defect minimizing technology |
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| CN201510614652.9A CN105149727B (en) | 2015-09-24 | 2015-09-24 | A kind of medium carbon steel casting defect minimizing technology |
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| CN105149727A CN105149727A (en) | 2015-12-16 |
| CN105149727B true CN105149727B (en) | 2017-11-28 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107350600A (en) * | 2017-07-24 | 2017-11-17 | 共享铸钢有限公司 | Steel-casting carbon arc air gouging pre-heating mean |
| CN111730245A (en) * | 2020-06-22 | 2020-10-02 | 共享智能铸造产业创新中心有限公司 | Welding system and casting defect repair welding method |
| CN114453825A (en) * | 2022-01-27 | 2022-05-10 | 安徽应流铸业有限公司 | Welding repair method for defects of low-alloy high-strength steel casting |
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